Technically it's not legal - you still need a prescription.
That is incorrect my friend, go on the Met police web-site & check it out, or the HMC web-site.
I will go one further, when the police spun my house looking to do me for contravention of the 'class 1 fire arms act' they took all my bud, & my liquid LSD, but upon finding my amps of Test - they had to make a phone call, & were told to put it back in the box they found it in & move on!!
Supply is in contravention of UK law, personal possession is not.
I also got stopped at HMC, on my way back from the Algarve in 07, the customs guy saw my case full of test & Proviron tabs, & asked "is this all for personal consumption sir??" upon hearing me respond in the affirmative, he shut my case & thanked me for my time/cooperation
PT